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G.hn is the common name for a home network technology family of standards developed under the International Telecommunication Union's Telecommunication Standardization sector (the ITU-T) and promoted by the HomeGrid Forum and several other organizations. The G.hn specifications define networking over power lines, phone lines and coaxial cables with data rates up to 1 Gbit/s. ITU-T Recommendation (the ITU's term for standard) G.9960, which received approval on October 9, 2009,〔(New ITU standard opens doors for unified 'smart home' network ), ITU Press Release〕 specified the physical layers and the architecture of G.hn. The Data Link Layer (Recommendation G.9961) was approved on June 11, 2010.〔(United Nations ITU-T's G.hn Approved as Global Standard for Wired Home Networking )〕 The work was done in the ITU Telecommunication Standardization Sector, Study Group 15, Question 4. About 20 companies participated in the work, including telephone, communication equipment, and home networking technology companies. ==Unified communication== G.hn is a specification for existing-wire home networking. It is a complementary counterpart to Wi-Fi. G.hn targets gigabit per second data rates〔(DS2 Blog: How fast can G.hn be? )〕 and operation over three types of legacy home wires: telephone wiring, coaxial cables and power lines. A single G.hn semiconductor device is able to network over any of the supported home wire types. Some benefits of a multi-wire standard are lower equipment development costs and lower deployment costs for service providers (by allowing customer self-install).〔 The majority of devices in which G.hn may become embedded (such as televisions, set-top boxes, residential gateways, personal computers or network-attached storage devices) will be AC-powered, so configurations that have at least one power line networking interface are likely to become the most common. This will also facilitate integration with home control and demand side management applications for AC-powered appliances. The ITU-T extended the technology with multiple input, multiple output (MIMO) technology to increase data rates and signaling distance. 〔 The work on MIMO for G.hn at ITU-T is under the G.9963 standard. By developing dual mode devices , G.hn proponents believe it can provide an evolution path from other wired home networking technologies such as Multimedia over Coax Alliance (MoCA), HomePNA 3.1 over coax and phone wires (already an ITU standard G.9954), and HomePlug AV, Universal Powerline Association (UPA) and HD-PLC over powerline. Key promoters CEPCA, HomePNA, and UPA, creators of two of these interfaces, united behind the latest version of the standard in February 2009.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「G.hn」の詳細全文を読む スポンサード リンク
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